Nonsticking pneumatic hammer grease gun



- ay.M, l935. C.W.-GINTER 7 2,091,190

NONSTICKING PNEUMATIC HAMMER GREASE GUN I Filed Dec. .5, 1932 Patented May 14, 1935 PATENT OFFICE 7 NONSTICKING PNEUMATIC HAMMER GREASE GUN Charles W. Ginter, Bryan, Ohio, assignor to The Aro Equipment Corporation, Bryan, Ohio, a

corporation of Ohio Application December 5, 1932, Serial No. 645,737

6 Claims.

The object of this invention is to provide a non-sticking pneumatic hammer grease gun which is simple, durable, and comparatively inex pensive to manufacture.

A further object is to provide a grease gun of pneumatic hammer type in which "the parts are so arranged that the gun cannot get stuck during operation.

More particularly, it is my object to provide a pneumatic hammer grease gun in which a pneumatic hammer element is operable independent of the grease pumping mechanism and is so ported with respect to the travel of the grease plunger of the grease pumping mechanism that the pneumatic hammer element can reciprocate even when the plunger is stuck in its rea-rmost position, thus obtaining the advantage of hammer blows against the pumping mechanism to overcomethe high resistance which has caused a stuck condition of the plunger.

Still a further object is to provide a grease plunger having an impact-receiving member integral therewith and a pneumatic hammer element for operating the grease plunger which 'is connected with the grease plunger but is adapted to strike the impact-receiving member during the operation of the gun.

A further object is to proportion the parts of the gun so that when the grease plunger just covers the intake port for the cylinder in which the grease plunger operates, the pneumatic hammer element can travel to an exhaust position thereby permitting its operation or reciprocation to hammer against the impact-receiving element of the grease plunger to thus receive the benefit of impact blows for breaking clogged grease loose.

With these. and other objects-in view my invention consists in the construction, arrangement and. combination of the various parts of my device, whereby the objects contemplated are attained, as hereinafter more fully setforth, pointed out in-my claims, and illustrated in the accompanying drawing, in which:-

Figure 1 is a side elevation, partly in section. of a pneumatic grease gun of the non-sticking type embodying my invention.

Figure 2 is an enlarged sectional view on the line 2-2 of Figure 1.

referencev character A to indicate generally a grease gun barrel. The handle thereof is indicated at B. Within the barrel A there is provided a grease'cylinder ID, a grease intake 12 therefor and a grease plunger M which form a 5- grease pumping mechanism.

The plunger l lin my invention terminates at its rearmost end in an impact-receiving element 16. A piston I8 is provided'which travels in a cylinder 20. Within the handle B a passageway 10 22 ordinarily extends to a pneumatic hammer cylinder 24. By means of ports 28 and 30 and a passageway 22, I provide continuous communication between'the passageway 22 and the cylinder ahead of the piston l8. This obvious- )5 1y provides a means tending to retract the plunger I t.

Within the hammer element cylinder 24 I provide a pneumatic hammer element C having a piston 34 and a plunger 36. The plunger 36 ex- 20 tends through a partition 38 and into an exhaust cylinder 40. An exhaust port 42 provides communication between the cylinder 40 and atmosphere.

The pneumatic hammer element C is portedas indicated at 44 and has a bore 46 communicating with the cylinder 2d.

It will be noted that the hammer element 0 is independent of the greaseplunger N, that is it is not connected therewith. The ports 44 and I2 are so arranged and the parts of the pneumatic hammer element C and the grease plunger assembly l4, l6, and I8 are soproportioned that sticking of the plunger cannot occur, as will now be described.

Referring to Figure 3, air is entering through the port 22 and acting upon the piston 34 to retract the hammer element C. Air is also acting upon the piston l8 to retract the grease plunger l4. Under normal conditions the two will-move in retracting direction simultaneously with each other until the piston l8 strikes a partition It, which acts as a stop for it. The hammer element C, however, will continue to move toward the right until the ports 44 pass the partition 38 as shown in Figure 4, whereupon air will enter through the port 44 and the bore 46 to cushion the retracting movement of the element C and force it in the opposite direction.

member I6 has received the benefit of being forced in a grease expelling direction by the compressed air behind the piston 34 and also by the inertia of the hammer element C. It will be noted that the ports 44 in Figure 4 (dotted line position) have passed the partition 38, thus resulting in an exhaustion of the air from the cylinder 24 to the cylinder 40 and then to atmosphere through the exhaust port 42. Thus, if too great resistance is offered to the travel of the plunger I4 or in other words--if it is likely to become stuck it at least can travel to the dotted line position causing the grease in front of it to back up in the intake port 12 and if it can go no farther than the dotted line position of Figure 4 then the reciprocation of the hammer element C can be reversed and the hammer will actually keep delivering its impact blows to the impact-receiving member I6 to break the grease loose. It will thus be obvious that the hammer element C cannot become stuck in one position even though the plunger I4 fails to pump grease on account of a higher resistance encountered than it is possible for the available air pressure to overcome.

From the description of my invention it will be obvious that when the gun normally operates impact blows are delivered because of the space between the element [6 and the element C in Figure 4, and that when non-normal conditions, such as those which cause sticking of the grease plunger, occur there is still operation of the hammer element, the proportions of the parts and the positions of the ports being so arranged as to permit this.

Some changes may be madein the construction and arrangement of the parts of my device without departing from the real spirit and purpose of my invention, and it is my intention to cover by my claims, any modified forms of structure or use of. mechanical equivalents, which may be reasonably included within their scope.

I claim as my invention:

1. In a pneumatic hammer grease gun, a grease cylinder, a grease plunger reciprocable therein, a grease intake port in said cylinder, impactreceiving means connected with said grease plunger, a reciprocable pneumatic hammer element independently movable with respect to and engageable with said impact-receiving means to operate said grease plunger from position with said intake port open to discharge position with said intake port closed, said pneumatic hammer element having integral compressed air control valve ports arranged in position to cause reciprocation of said hammer element.

2. In a pneumatic hammer grease gun, a grease cylinder, a grease plunger reciprocable therein, a grease intake port in said cylinder, impact-receiving means connected with said grease plunger, 21. reciprocable pneumatic hammer element independently movable with respect to and engageable with said impact-receiving means to operate said grease plunger from position with said intake port open to discharge position with said intake port closed, said pneumatic hammer element having integral compressed air control valve ports arranged in position to cause reciprocation of said hammer element and means constraining said impact receiving member to draw grease into said pump mechanism.

3. In a pneumatic hammer grease gun, a grease cylinder, a grease plunger reciprocable therein, a grease intakeport in said cylinder, impactreceiving means connected with said grease plunger, a reciprocable pneumatic hammer element independently movable with respect to and engageable with said impact-receiving means to operate said grease plunger from position with said intake port open to discharge position with said intake port closed, said pneumatic hammer element having integral compressed air control valve ports arranged in position to cause reciprocation of said hammer element and pneumatic means constraining said impact-receiving member toward retracted position.

4. In a pneumatic hammer grease gun, a grease pump comprising a grease cylinder, a grease plunger reciprocable therein having an impactreceiving element, a grease intake port in said cylinder and means to cause said impact receiving element to draw grease in through said port and a pneumatic hammer means for reciprocating said grease plunger comprising a cylinder having a ported pneumatic hammer element engageable with but unattached to said impact-receiving element.

5. In a pneumatic hammer grease gun, a grease pump comprising a grease cylinder, a grease plunger reciprocable therein having an impactreceiving element, a grease intake port in said cylinder and means to cause said impact receiving element to draw grease in through said port and a pneumatic hammer means for reciprocating said grease plunger comprising a cylinder having a ported pneumatic hammer element engageable with but unattached to said impactreceiving element under both normal and stuck plunger conditions;

6. In a pneumatic hammer grease gun, a grease pump comprising a grease cylinder, 9. grease plunger reciprocable therein having an impactreceiving element, a grease intake port in said cylinder and means to cause said impact receiving element to draw grease in through said port and a pneumatic hammer means for reciprocating said grease plunger comprising a cylinder, a pneumatic hammer element engageable with but unattached to said impact-receiving element, said CHARLES W. QINTER. 

